Your sex is not an identity (inherently, at least- people can make it part of their identity).

There’s different contexts for the word (chromosomal, phenotypical, etc), but generally speaking the average of all of them is what you are described as in a biological sense, gender aside.

I’m still running into new identities, expressions, and interpretations, but so far everything I’m aware of holds at least that much in common.

Am I missing something? Genuine question.